15=8+-a

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Solution for 15=8+-a equation:


Simplifying
15 = 8 + -1a

Solving
15 = 8 + -1a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add 'a' to each side of the equation.
15 + a = 8 + -1a + a

Combine like terms: -1a + a = 0
15 + a = 8 + 0
15 + a = 8

Add '-15' to each side of the equation.
15 + -15 + a = 8 + -15

Combine like terms: 15 + -15 = 0
0 + a = 8 + -15
a = 8 + -15

Combine like terms: 8 + -15 = -7
a = -7

Simplifying
a = -7

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